Subgridded FDTD Modeling of Ground Penetrating Radar Scenarios Beyond the Courant Stability Limit
Subgridded FDTD Modeling of Ground Penetrating Radar Scenarios Beyond the Courant Stability Limit
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DOI：
10.1109/tgrs.2017.2747404
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发表时间：
2017-09
影响因子：
8.2
通讯作者：
X. Wei;Xingqi Zhang;N. Diamanti;W. Shao;C. Sarris
中科院分区：
文献类型：
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作者：
X. Wei;Xingqi Zhang;N. Diamanti;W. Shao;C. Sarris
本文提出了一种高效的 3-D 时域有限差分 (FDTD) 子网格方案，该方案不受 Courant-Friedrichs-Lewy 稳定性条件的影响，用于有损色散介质中探地雷达 (GPR) 场景的建模。采用子网格内 FDTD 场的空间滤波来渲染独立于精细单元子网格中的单元大小的时间步长。该过程的应用对原始 FDTD 代码进行了最小程度的修改，没有隐式操作，并且计算开销非常小。此外，还包含多项色散来模拟实际的探地雷达场景，包括检测色散土壤中的真实散射体。提供了几个数值示例来证明所提出的方法作为强大的探地雷达建模工具的潜力。
This paper presents an efficient 3-D finite-difference time-domain (FDTD) subgridding scheme that is free of the Courant–Friedrichs–Lewy stability condition, for the modeling of ground-penetrating radar (GPR) scenarios in lossy dispersive media. Spatial filtering of FDTD fields within the subgrid is employed to render the time step independent of the cell size in the fine-cell subgrids. This process is applied with minimal modification of the original FDTD code, no implicit operations, and very modest computational overhead. Moreover, multiterm dispersion is included to model practical GPR scenarios involving the detection of realistic scatterers within dispersive soil. Several numerical examples are provided to demonstrate the potential of the proposed method as a powerful GPR modeling tool.